After the developers, it's the beta testers' turn to get their hands on the first iOS 13.4 beta. Indeed, Apple offers tonight the public beta of this version which brings some nice new features.
To benefit from it, nothing more simple, just register for the testers program on beta.apple.com. Then you will need to download and install the iOS 13.4 bta profile. Once your devices have restarted, just go to the app Settings> General> Software update. Apple will then invite you to download this first public beta. Finally, let the installation process go to the end. Your device will restart one last time before you can enjoy this version.